lst = [1,2,4,8,16,32,64,128,256,512,1024,32769,65536,4294967296]
# 输出 { 1:[1,2,3,8], 2:[16,32,64], 3:[128,256,512], 4:[1024,], 5:[32769,65536], 6:[4294967296] }
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
dic={} for i in lst: len_i=len(str(i)) dic.setdefault(len_i,[]).append(i) print(dic)
请尽量用简洁的方法将二维数组转换成一维数组
例: 转换前 lst=[[1,2,3],[4,5,6],[7,8,9]]
转换后 lst = [1,2,3,4,5,6,7,8,9]
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
lst = [[1, 2, 3], [4, 5, 6], [7, 8, 9]] #列表推导式 lst=[j for i in lst for j in i] print(lst) #for循环 a=[] for i in lst: a.extend(i) lst=a print(lst)
给定两个 list:A,B,请用 Python 找出 A,B 中相同的元素,A,B 中不同的元素 复制代码 1 A=[1,3,7,0,5,11] 2 B=[11,4,6,8,0] 3 # 方法一:列表操作 4 s=[i for i in A for j in B if j==i] 5 print(s) 6 d=[] 7 for i in A: 8 if i not in s: 9 d.append(i) 10 for i in B: 11 if i not in s: 12 d.append(i) 13 print(d) 14 15 #方法二:集合操作 16 s=set.intersection(set(A),set(B)) 17 d=set.difference(set.union(set(A),set(B)),set(s)) 18 print(s) 19 print(d)
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